Calayag, K. (2021). Sinovac vaccines here end of February – Palace. Manila Times.
芝加哥风格引文Calayag, Keith. "Sinovac Vaccines Here End of February – Palace." Manila Times 2021.
MLA引文Calayag, Keith. "Sinovac Vaccines Here End of February – Palace." Manila Times, 2021.
警告：这些引文格式不一定是100％准确.